Made by the Cummings Gun Works of Boston late in World War One, this is a pseudo-firearm training device for teaching some aspects of marksmanship without the safety hazard of bullets actually flying around. This one appears to be intended to teach shooters to hold the rifle perfectly vertical. Equally interesting to me is the use of unfinished Mosin Nagant components, almost certainly procured from Remington when its Mosin Nagant contract was interrupted by the Russian Revolution.